In order to study the effect of high-temperature diffusion annealing on the microstructure of 6Cr5Mo2V1 alloy tool steel, thermodynamic phase diagram calculations were conducted, and high-temperature diffusion annealing experiments at different temperatures were performed to analyze the effects of high-temperature diffusion annealing on the microstructure and alloying elements of 6Cr5Mo2V1 alloy tool steel, while friction and wear performance tests were also carried out. The results show that after holding 6Cr5Mo2V alloy tool steel at 1 230 ℃ for 3 hours, Cr-rich carbides diffuse and dissolve into the matrix, significantly alleviating compositional segregation. However, primary carbides rich in V and Mo with sizes ranging from 10 to 50 μm are highly stable and difficult to dissolve during the homogenization process. When the diffusion annealing temperature reaches 1 250 ℃, the low-melting-point eutectic structure remelts, forming micropores after cooling. Friction and wear tests indicate that samples subjected to 1 230 ℃ diffusion annealing exhibit the highest tribological stability.
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